Points for attention in positioning and installation of shaft parts

1 Two center holes are used for positioning and clamping

Generally, the important cylindrical surface as a rough reference positioning, machining the center hole, and then the center hole at both ends of the shaft for positioning precision reference; As far as possible to achieve a unified benchmark, benchmark overlap, mutual reference, and achieve a single installation processing of multiple surfaces. The center hole is the workpiece processing of the unified positioning datum and test datum, its own quality is very important, its preparation work is relatively complex, often to support the journal positioning, car (drilling) center cone hole; Again to the center hole positioning, fine car round; Outer circle positioning, rough grinding cone hole; To the center hole positioning, fine grinding round; Finally, to support the cylindrical positioning of the journal, fine grinding (scraping or grinding) of the cone hole, so that the accuracy of the cone hole to meet the requirements.

2 Use cylindrical surface positioning clamp

In cases where it is impossible to position a hollow shaft or a short shaft with a center hole, the cylindrical surface of the shaft can be used to position, clamp and transmit torque. General use of three jaw chuck, four jaw chuck general fixture, or a variety of high-precision automatic centering fixture, such as liquid plastic thin-wall centering fixture, diaphragm chuck, etc.

3 With a variety of plugs or tie rod mandrel positioning clamp

Machining the cylindrical surface of the hollow shaft, commonly used with a center hole of various plugs or tie rod mandrel to install the workpiece. Small cone hole often use plug; A tie rod mandrel with a plug is often used for large taper holes.